A prominent Iranian human rights lawyer has been sentenced to 13 years in prison by a Tehran revolutionary court, his daughter has said.

Abdolfattah Soltani was originally given 18 years but appealed and has now been told more years will be taken off if he denounces the Iranian Nobel peace laureate Shirin Ebadi.

Maede Soltani, who lives in Germany, said her family was officially notified on Monday of last week's appeal ruling.

Abdolfattah Soltani co-founded the Centre for Human Rights Defenders with Ebadi. He was arrested last year.

A court in March initially sentenced the 58-year-old to 18 years in prison on various charges, including co-founding the centre, spreading anti-government propaganda and endangering national security.

"My father was told that his sentence would be reduced [further] if he would apologise and speak out against Ms Ebadi in an open letter or an interview," Maede Soltani said. "He declined."

Amnesty International maintains Soltani is a "non-violent political prisoner who is being jailed only for his legitimate activities" as a human rights lawyer.

"Abdolfattah Soltani is one of the bravest human rights defenders in Iran," Amnesty said after his detention last September, urging his immediate release.

Maede Soltani said on Tuesday that last week's "politically motivated" ruling could not be appealed against a second time.

Soltani was previously arrested for seven months in 2005 and again for several months in the wake of Iran's disputed presidential elections in 2009. The revolutionary court also upheld the decision to transfer Soltani to a remote prison in the city of Borazjan, about 620 miles (1,000km) south-west of Tehran, Maede Soltani said, adding that the family would barely be able to visit him there.

Working alongside Ebadi, the lawyer also represented the family of the photojournalist Zahra Kazemi, a Canadian of Iranian origin who was arrested for taking photographs in front of Evin prison and died several days later in the prison, possibly after being tortured.

An investigative panel concluded that Kazemi died of a fractured skull and brain haemorrhage caused by a "physical attack" but the findings were rejected by Iran's conservative judiciary.